Re: Date formatting.

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From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: Date formatting.
Date	Mon, 29 Sep 2025 21:52:05 +0200
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On 2025-09-29 21:40, Lawrence D’Oliveiro wrote:
> On Mon, 29 Sep 2025 18:30:06 +0100, Pancho wrote:
> 
>> I like YYYYMMDD too, but the real epiphany moment for me was when I
>> realised that all dates should be handled internally UTC, Unix time,
>> and that output format, display, is just a user preference.
> 
> As far as I can tell, it was Unix that pioneered the idea of maintaining
> system time as UTC (actually GMT in the early days), and converting back
> and forth as necessary for human interpretation. Other systems continued
> to resist the idea for decades afterwards. Windows still doesn’t do it
> today. macOS --- who can tell?

Windows has a registry boolean option to store the CMOS time as UTC. I 
have no idea if this also means internally.

> 
>> It is so obvious, and yet I worked on so many systems that messed up
>> date conversions/different time zones.
> 
> All too common, on systems like Microsoft Windows that maintain system
> time as local time, to forget that they have done the daylight-saving
> switch once, and do it a second time. That kind of bug can’t happen when
> system time is maintained as UTC.
> 
> There is an article on Bitsavers which mentions that IBM mainframes needed
> to be rebooted to switch daylight saving on and off.


-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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